催化学报 ›› 2013, Vol. 34 ›› Issue (10): 1905-1913.DOI: 10.1016/S1872-2067(12)60672-X

• 研究论文 • 上一篇    下一篇

Precursors of active Ni species in Ni/Al2O3 catalysts for oxidative dehydrogenation of ethane

Lucie Smolákováa, Šárka Botkováa, Libor Čapeka, Peter Priecela, Agnieszka Sołtyseka, Martin Kouta, Lenka Matějováb   

  1. a Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic;
    b Nanotechnology Centre, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic
  • 收稿日期:2013-06-12 修回日期:2013-07-24 出版日期:2013-09-29 发布日期:2013-09-29

Precursors of active Ni species in Ni/Al2O3 catalysts for oxidative dehydrogenation of ethane

Lucie Smolákováa, Šárka Botkováa, Libor Čapeka, Peter Priecela, Agnieszka Sołtyseka, Martin Kouta, Lenka Matějováb   

  1. a Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic;
    b Nanotechnology Centre, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic
  • Received:2013-06-12 Revised:2013-07-24 Online:2013-09-29 Published:2013-09-29
  • Contact: Libor Čapek

摘要:

Ni/Al2O3 catalysts for oxidative dehydrogenation (ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate, and by mechanical mixing of NiO and Al2O3. The Ni-based catalysts were characterized by N2 adsorption-desorption, X-ray diffraction, diffuse reflectance UV-visible diffuse reflectance spectroscopy, and temperature-programmed reduction of hydrogen. The results showed that formation of crystalline NiO particles with a size of < 8 nm and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction conditions. In contrast, tetrahedral Ni species present in the catalysts led to higher selectivity for ethene. Formation of large crystalline NiO particles (22-32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.

关键词: Nickel, Alumina, Ethane, Oxidative dehydrogenation, Nickel species

Abstract:

Ni/Al2O3 catalysts for oxidative dehydrogenation (ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate, and by mechanical mixing of NiO and Al2O3. The Ni-based catalysts were characterized by N2 adsorption-desorption, X-ray diffraction, diffuse reflectance UV-visible diffuse reflectance spectroscopy, and temperature-programmed reduction of hydrogen. The results showed that formation of crystalline NiO particles with a size of < 8 nm and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction conditions. In contrast, tetrahedral Ni species present in the catalysts led to higher selectivity for ethene. Formation of large crystalline NiO particles (22-32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.

Key words: Nickel, Alumina, Ethane, Oxidative dehydrogenation, Nickel species